Apparatus for truing grinding wheels for grinding gear-wheel teeth



Mamh17,1925. 1,530,357

5. DE JONG APPARATUS FOR TRUING GRINDING WHEELS FOR GRINDING GEAR WHEEL TEETH Filed Aug. 14, 1924 proved apparatus gium, 23

Patented Mar. 17, 1 925.

UNITED STATES 1,530,351 P T NT- OFFICE;

SYLVAIN DE Jone, or nn'rwrflr, BELGIUM. APPARATUS ron 'rnnme GRINDING WHEELS Eon GRINDING GEAR-WHEEL Application filed August 14-, 1924. Serial No. 732,098

To all 207mm it may concern:

Be it known that I, SYLVAIN on Jone,-

new and useful Improvements in Apparatus for Truing Grinding \Vheels for Grinding Gear-\Vheel is a specification. I

The present invention relates to an imfor truing wheels for use in grinding the faces of gear wheel teeth, and in order that the said invention may be readily understood, an

embodiment of the said apparatus is, by

way of example only, illustrated by the accompanying drawing, wherein:

Fig. 1 is a perspective view'showing the complete apparatus according 'to the -in-- vention with the parts in the position which they occupy. for truing one face of the grinding wheel,

Fig. 2 1s .a similar view, showing the parts inthe positionwhich they occupy for truing the other face of the grinding wheel, Fig. 3 is a perspective view showing the I gear wheel of which the teeth have to. be

ground n position in relation to the grinding wheel, and f Fig. 4 is a detail at an enlarged scale.

Referring to the said drawing, the apparatus according to the invention substan-' tially comprises a yoke member a carrying the diamond-holder a and of'which one end is connected by means of a universal joint 6 to a spindle m which is placed between the centres e and,.g of the machine which normally serves for grindingthe faces of the gear wheel teeth. The other end of the yoke-member a is provided with a finger i which engages and follows the contour o a template disc (1 which is integrally mounted on the spindle m and determines the contour of' the teeth, of which the development is amplified in order to correct the difi'erences which might be present on a small curve which is difiicult to obtain with accuracy.

The diamond-holder a carrying the diamond is placed centrally between the fixed point of articulation of the yoke-member a Avenue Van Put, have invented- Teeth, of which the following grindin g p of the grinding wheel may vary,

full width of the tooth space, to any width TEETH.

joint I), the point of the diamond c and the knife edge of the template disc at The diamond may thus quite readily be placed in the position which it should occupy to obtain an exact reproduction of the contour of the template disc (1, and the small amount of wear of the diamond may also 'be practically and rapidly compensated.- The spindle. mis

provided with two drivers it placed at its two ends but in diametrally opposite direction,'so that the apparatus as a wholemay readily be reversed between the centres e and g (see Figures 1 and 2 respectively) in order to allow the truing of both faces of the grinding wheel in an absolutely symmetrical manner and with a complete identity of shape and position in relation to the alined centres a and g.

. The spindle m is placed between the said place and stead of the centres exactly in the spindle carrying the work. v The angular setting of the apparatus be tween the centres is of no importance as far as the correction of the tooth' profile to be finger 71' following thegroundis concerned, as the profile of the grinding wheel is always trued in a mathematical exact relation to the centres carrying the work; and therefore the thickness less than the tooth space, as long as the outer edge of the grinding'wheel is .strong enough not to crumble away. This is shown in Figure 4.

from the The described apparatus, which is simple 7 and light, may readily be applied for truing the grinding wheel of a battery of machinessimultaneously, and does not take any more time than putting an ordinary man- The said appato be obtained.

The operation of the apparatus referred to will be readily understood from the above description.

. The apparatus as a .whole is placed between the centres e and 9, Without clearance, the driver at being insertedin the carrier p of the dividing head; it will then be sufiicient to bring the diamond in contact with the grinding wheel by effecting the angularadjustment of the driver in relation to the carrier by means of the twoset screws r and to cause the follower finger ito follow the contour of the template-disc (1 until the grinding wheel is properly touched for the complete curve. Then, without changing anything either to the grinding wheel or to the relative adjustment of the driver and carrier, the apparatus as a whole should be merely reversed between the centres when the other side or face of the grinding wheel has to be trued in turn.

It'should be understood that the axis of the grinding wheel may be lowered in relation to that of the centres of'the machine as the grinding wheel wears, but a truing of the grinding wheel in this case is necessary before the work is put in position.

The contour of the grinding wheel is thus obtained in a perfect manner with a single template disc and a single diamond.

I claim:

In an apparatus for truing grindingwheels for grinding the profile of gear wheel teeth, to be used in connection with a machine for grinding gear-wheel teeth normally comprising a removable spindle carrying the gear-wheel to be ground, thecomthe geometric centre of the .pitch circle ofthe gear-wheels to be ground, a template disc fixed on one end of the last-named spindle, a yoke-member having one of its ends connected to the other end of said last-named spindle by means of a universal joint, :1 follower finger fixed to the other end of said yoke-member and engaging the periphery of the template disc, and an adjustable diamond-holder mounted centrally in the said yoke-member and fitted with a diamond, substantially as described. a

In testimony whereof I signed hereunto my name in the presence of two subscribing witnesses.

s. DE JONG. W'itnesses H. KARNEL, M. BLAION. 

